4/8ohms help Ampeg SVT 3pro

[originalfunster]

Hi All,

complete idiot here needs some advise.

I have a T/E 4 x 10 300w cab and a T/E 2 x 10 300w. I am fairly sure that both cabs are 8ohms.
I have an ampeg SVT 3pro head which says on the back min speaker load 4ohms.
as I am sure each of mine are 8 (and 8 being greater than 4) can I safely connect either of my 2 cabs without blowing anything to bits?
(dont want to cart both cabs to rehersal)

Cheers

Edited October 21, 2007 by originalfunster

[LukeFRC]

yes. if you plug one in it will give you 8 ohms
plug two in in parallel (as in both into the back of the amp) it will give you 4 ohms.

[MB1]

[quote name='originalfunster' date='Oct 21 2007, 09:43 PM' post='77494']
Hi All,

complete idiot here needs some advise.

I have a T/E 4 x 10 300w cab and a T/E 2 x 10 300w. I am fairly sure that both cabs are 8ohms.
I have an ampeg SVT 3pro head which says on the back min speaker load 4ohms.
as I am sure each of mine are 8 (and 8 being greater than 4) can I safely connect either of my 2 cabs without blowing anything to bits?
(dont want to cart both cabs to rehersal)

Cheer

MB1.

NO! it doesnt work like that you can either use a 4 ohm single cabinet or 2 x 8 ohm cabinets which if wired in parallel will give you 4 ohm.DONT use one 8 ohm as youll damage the amp.

[Musky]

The SVT3 has a transistor power stage does it not? In which case plugging in an 8 ohm cab won't blow it up, it just won't produce as much power.

But yeah, two 8 ohm cabs will be just fine.

[Buzz]

[quote name='MB1' post='77518' date='Oct 21 2007, 10:21 PM']NO! it doesnt work like that you can either use a 4 ohm single cabinet or 2 x 8 ohm cabinets which if wired in parallel will give you 4 ohm.DONT use one 8 ohm as youll damage the amp.[/quote]

Que?

Min load is 4 ohms. A single 8 ohm would be perfectly fine and safe, you just wouldn't get all the power.

2x 8hm = 4ohm load.

You could also use 2x16 ohms, which'll give you 8 ohms, but again, it won't give you all the power.


2x 4 ohms on the other hand would kill it ( = 2 ohm load)


Edit:

Impedence works in the opposite direction to the figures so to speak, lower numbers = less resistance -> more power. The SVT P3 can run at 4ohms and put out 450w, or 275 at 8ohms.
The amp cannot handle the power output with a 2 ohm impendance, therefore will go bang.
(yes, simplifed it, but still correct).

LOOK AT THE STICKIES AT THE TOP OF THIS FORUM!

Edited October 21, 2007 by Buzz

[MB1]

MB1.

that was what i meant,2x8 ohm will give you 4 ohm.
I own a SVT CL and AMPEG advise you to use 2x8 ohm cabs to get the full power power at 4 ohm.

[obbm]

According to the manual the Ampeg SVT-3 PRO has a solid-state output stage so you can use either a single 4-ohm cab or two 8-ohm cabs to extract the quoted max power of 450-watts You can also use a single 8-ohm cab to achieve a reduced ax output of 275-watts.

If it had a valve/tube output stage then you would have to match the cab(s) to the amp.

[MB1]

[quote name='obbm' date='Oct 21 2007, 10:57 PM' post='77550']
According to the manual the Ampeg SVT-3 PRO has a solid-state output stage so you can use either a single 4-ohm cab or two 8-ohm cabs to extract the quoted max power of 450-watts You can also use a single 8-ohm cab to achieve a reduced ax output of 275-watts.

If it had a valve/tube output stage then you would have to match the cab(s) to the amp.

MB1.

Thats that sorted then....anyone got a spare svt 4x10 hlf (4OHM!) ........Im also ,not one to take two bottles into the shower!

[ashevans09]

Indeed, well explained

Absolutely love my SVT 3, anyone else love ampeg here?

[cetera]

Never had a problem with my SVT3. Been super reliable and sounds great...

[originalfunster]

Cheers for the replys, just wanted to make sure before making a very expensive mistake

[rodl2005]

I LOVE AMPEG here too- I've a V4BH 100w all tube! Used to have a SVT3PRO, but had to get "back to my roots" all valve! Loved the 3PRO when I had it tho! & -again- you'll be fine with 2 8 ohm cabs or one 4 ohm cab. I had the 410HLF when I had my 3PRO- a great rig!